linux输入yum后提示： -bash: /usr/bin/yum: No such file or directory的解决方案

yum remove yum

1  [root@localhost ~]# yum 
2  -bash: /usr/bin/yum: No such file or directory 

1  rpm -ivh  --nodeps http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-fastestmirror-1.1.16-14.el5.centos.1.noarch.rpm  
2  rpm -ivh  --nodeps http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-metadata-parser-1.1.2-3.el5.centos.x86_64.rpm  
3  rpm -ivh  --nodeps http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-3.2.22-26.el5.centos.noarch.rpm

1 --nodeps                         don‘t verify package dependencies 

 1  [root@localhost ~]# yum 
 2  There was a problem importing one of the Python modules 
 3  required to run yum. The error leading to this problem was: 
 4   
 5  libxml2.so.2: cannot open shared object file: No such file or directory 
 6   
 7  Please install a package which provides this module, or 
 8  verify that the module is installed correctly. 
 9   
10  It‘s possible that the above module doesn‘t match the 
11  current version of Python, which is: 
12  2.4.3 (#1, Nov 11 2010, 13:30:19)  
13  [GCC 4.1.2 20080704 (Red Hat 4.1.2-48)] 
14   
15  If you cannot solve this problem yourself, please go to  
16  the yum faq at: 
17  http://wiki.linux.duke.edu/YumFaq 

 1 [root@localhost~]# python 
 2  Python 2.4.3 (#1, Nov 11 2010, 13:30:19)  
 3  [GCC 4.1.2 20080704 (Red Hat 4.1.2-48)] on linux2 
 4  Type "help", "copyright", "credits" or "license" for more information. 
 5  >>> import yum 
 6  Traceback (most recent call last): 
 7    File "<stdin>", line 1, in ? 
 8    File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 54, in ? 
 9      import transactioninfo 
10    File "/usr/lib/python2.4/site-packages/yum/transactioninfo.py", line 31, in ? 
11      from sqlitesack import YumAvailablePackageSqlite 
12    File "/usr/lib/python2.4/site-packages/yum/sqlitesack.py", line 26, in ? 
13      import yumRepo 
14    File "/usr/lib/python2.4/site-packages/yum/yumRepo.py", line 32, in ? 
15      import sqlitecachec 
16    File "/usr/lib64/python2.4/site-packages/sqlitecachec.py", line 19, in ? 
17      import _sqlitecache 
18  ImportError: libxml2.so.2: cannot open shared object file: No such file or directory 
19  >>>  

rpm -ivh http://mirrors.163.com/centos/5/os/x86_64/CentOS/libxml2-2.6.26-2.1.2.8.x86_64.rpm

 1 [root@localhost ~]# yum 
 2  Loaded plugins: fastestmirror 
 3  You need to give some command 
 4  usage: yum [options] COMMAND 
 5   
 6  List of Commands: 
 7   
 8  check-update   Check for available package updates 
 9  clean          Remove cached data 
10  deplist        List a package‘s dependencies 
11  downgrade      downgrade a package 
12  erase          Remove a package or packages from your system 
13  groupinfo      Display details about a package group 
14  groupinstall   Install the packages in a group on your system 
15  grouplist      List available package groups 
16  groupremove    Remove the packages in a group from your system 
17  help           Display a helpful usage message 
18  info           Display details about a package or group of packages 
19  install        Install a package or packages on your system 
20  list           List a package or groups of packages 
21  localinstall   Install a local RPM 
22  makecache      Generate the metadata cache 
23  provides       Find what package provides the given value 
24  reinstall      reinstall a package 
25  repolist       Display the configured software repositories 
26  resolvedep     Determine which package provides the given dependency 
27  search         Search package details for the given string 
28  shell          Run an interactive yum shell 
29  update         Update a package or packages on your system 
30  upgrade        Update packages taking obsoletes into account 
31   
32   
33  options: 
34    -h, --help            show this help message and exit 
35    -t, --tolerant        be tolerant of errors 
36    -C                    run entirely from cache, don‘t update cache 
37    -c  [config file]     config file location 
38    -R  [minutes]         maximum command wait time 
39    -d  [debug level]     debugging output level 
40    --showduplicates      show duplicates, in repos, in list/search commands 
41    -e  [error level]     error output level 
42    -q, --quiet           quiet operation 
43    -v, --verbose         verbose operation 
44    -y                    answer yes for all questions 
45    --version             show Yum version and exit 
46    --installroot=[path]  set install root 
47    --enablerepo=[repo]   enable one or more repositories (wildcards allowed) 
48    --disablerepo=[repo]  disable one or more repositories (wildcards allowed) 
49    -x [package], --exclude=[package] 
50                          exclude package(s) by name or glob 
51    --disableexcludes=[repo] 
52                          disable exclude from main, for a repo or for 
53                          everything 
54    --obsoletes           enable obsoletes processing during updates 
55    --noplugins           disable Yum plugins 
56    --nogpgcheck          disable gpg signature checking 
57    --disableplugin=[plugin] 
58                          disable plugins by name 
59    --enableplugin=[plugin] 
60                          enable plugins by name 
61    --skip-broken         skip packages with depsolving problems 
62    --color=COLOR         control whether color is used 
63   
64    Plugin Options: 

1 yum update